Comparison
Overview
Company snapshot and where each provider is based.
| Field | Prelude | SmsManager |
|---|---|---|
| What it is | Developer platform for phone and email verification (OTP), authentication, number intelligence, and anti-fraud onboarding delivered across SMS, RCS, WhatsApp, voice and other channels. | Czech bulk-messaging platform for sending SMS, WhatsApp, Viber and RCS messages from a web application or a single JSON API, with direct connections to local mobile operators. |
| Founded | 2022 | 2011 |
| Ownership | private | private |
| Employees | 51-200 | 1-5 |
| HQ city | Paris | Prague |
| HQ country | France (EU) | Czech Republic (EU) |
What's the differencePrelude edges ahead on the overall messaging.dev Score (62 vs 51). Prelude is private and headquartered in Paris, France (EU); SmsManager is private and based in Prague, Czech Republic (EU).
Channels
Which messaging channels each provider can send and receive on.
| Field | Prelude | SmsManager |
|---|---|---|
| SMS | Yes | Yes |
| MMS | No | No |
| RCS | Yes | Yes |
| Yes | Yes | |
| Viber | Yes | Yes |
| Facebook Messenger | No | No |
| Telegram | Yes | No |
| Apple Messages for Business | No | Yes |
| Voice | Yes | No |
| Yes | No |
What's the differenceThey share 4 channels. Prelude additionally offers Telegram, Voice, Email, while SmsManager additionally offers Apple Messages for Business.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | Prelude | SmsManager |
|---|---|---|
| Self-service onboarding | Yes | Yes |
| Free developer credit | No | Yes |
| Docs quality | high | high |
| Documentation | Open ↗ | Open ↗ |
| SDKs | Node.js, Python, Go, Java, Ruby, PHP, C# | JavaScript/TypeScript, PHP |
| Sandbox / test env | No | Yes |
| API types | REST | REST |
What's the differenceOn SDKs, Prelude adds Node.js, Python, Go, Java, Ruby, C#; SmsManager adds JavaScript/TypeScript; SmsManager offers Sandbox / test env, while Prelude does not.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | Prelude | SmsManager |
|---|---|---|
| EU data residency | Yes | Yes |
| US data residency | No | No |
| Choose region | No | No |
| GDPR | Yes | Yes |
| ISO 27001 | Yes | No |
| SOC 2 | Yes | No |
| HIPAA | No | No |
What's the differencePrelude offers ISO 27001, while SmsManager does not; Prelude offers SOC 2, while SmsManager does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | Prelude | SmsManager |
|---|---|---|
| Retention policy | Not publicly documented in detail. Prelude is a European (Paris-based) company that hosts and processes data in EU data centers under GDPR, with SOC 2 Type 2 and ISO 27001:2022 controls including encryption of data in transit and at rest. It states that only essential data is stored for delivery tracking, but specific message-content and metadata retention periods are not published on the site or trust center. | Under the published GDPR data processing agreement, message records (phone number and message text) older than 12 months are automatically deleted by default unless otherwise agreed; encrypted backups are kept 30 days and system logs 180 days. After contract termination, personal data is deleted or exported (CSV) free of charge within 30 days. |
What's the differencePrelude: Not publicly documented in detail. Prelude is a European (Paris-based) company that hosts and processes data in EU data centers under GDPR, with SOC 2 Type 2 and ISO 27001:2022 controls including encryption of data in transit and at rest. It states that only essential data is stored for delivery tracking, but specific message-content and metadata retention periods are not published on the site or trust center. SmsManager: Under the published GDPR data processing agreement, message records (phone number and message text) older than 12 months are automatically deleted by default unless otherwise agreed; encrypted backups are kept 30 days and system logs 180 days. After contract termination, personal data is deleted or exported (CSV) free of charge within 30 days.
Pricing & Credits
Pricing model and the cost of a first message.
| Field | Prelude | SmsManager |
|---|---|---|
| Pricing model | Pay-as-you-go per-verification pricing plus at-cost (zero-markup) per-message charges, with optional Startup subscription and custom Enterprise tiers. | Prepaid credit pay-as-you-go: free account, non-expiring credit topped up by card or bank transfer, charged only per message sent, with volume-tiered discounts and optional subscription add-on services. |
| SMS starting price | €0.0043 per SMS (US, at-cost); verification fee from €0.032 | €0.0356 per SMS to the Czech Republic (5,001-10,000 message volume tier; promotional rate €0.032), other destinations priced per country |
| Free developer credit | No | Yes |
What's the differencePrelude and SmsManager are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | Prelude | SmsManager |
|---|---|---|
| Countries covered | 230 | 175 |
| Direct operator connections | Yes | Yes |
| Published uptime SLA | No published SLA | No published SLA (individual SLA agreements available) |
What's the differencePrelude leads on Countries covered (230 vs 175 for SmsManager).
Company & Trust
Independent reviews and company profile.
| Field | Prelude | SmsManager |
|---|---|---|
| G2 rating | 4.9 | 0.0 |
| G2 reviews | 13 | 0 |
| Ownership | private | private |
| Employees | 51-200 | 1-5 |
What's the differencePrelude leads on G2 rating (4.9 vs 0 for SmsManager); Prelude leads on G2 reviews (13 vs 0 for SmsManager).
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